[Shop-talk] Toughest EE question ever asked here.

[Bob Spidell]

Most of the modern proxcards are the 'electrostatic' type. The sensor energizes a transponder circuit in the card and it transmits back the key code. 

A cellphone in proximity might overwhelm the transponder. 

Bob 


-------------------------------- 
Bob Spidell - San Jose, CA 

----- Original Message -----
From: pethier at comcast.net 
To: eric at megageek.com 
Cc: shop-talk at Autox.Team.Net 
Sent: Thursday, May 2, 2013 9:44:49 AM 
Subject: Re: [Shop-talk] Toughest EE question ever asked here. 

Can't figure that one out. A piece of aluminum foil keeps my office key and bus pass separated just fine.